64145645 has 4 divisors (see below), whose sum is σ = 76974780. Its totient is φ = 51316512.

The previous prime is 64145633. The next prime is 64145657. The reversal of 64145645 is 54654146.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64145633) and next prime (64145657).

It can be written as a sum of positive squares in 2 ways, for example, as 37136836 + 27008809 = 6094^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 64145645 - 2²² = 59951341 is a prime.

It is a super-3 number, since 3×64145645³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6414560 + ... + 6414569.

It is an arithmetic number, because the mean of its divisors is an integer number (19243695).

Almost surely, 2^64145645 is an apocalyptic number.

It is an amenable number.

64145645 is a deficient number, since it is larger than the sum of its proper divisors (12829135).

64145645 is a wasteful number, since it uses less digits than its factorization.

64145645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12829134.

The product of its digits is 57600, while the sum is 35.

The square root of 64145645 is about 8009.0976395597. The cubic root of 64145645 is about 400.3031972039.

The spelling of 64145645 in words is "sixty-four million, one hundred forty-five thousand, six hundred forty-five".